Vat sulphide dyes



Patented M129, 1926.

'- UNITED STATES PATENT OFFICE.

ABSIG-NORS TO GRASSELLI DYESTUFF CORPORATION, OF NEW YORK,

vn'r SULPHIIDE DYES.

Io Drawing. Application fled January 16, 1925, Serial No. 2,927, and in Germany January 24, 1224.

We have invented new and useful improve- I ments in vat sulphide dyes of which the following is a specification. Our invention consists I of new dyestufis capable of dyeing in a reducmg vat, and whlch-are obtained by submitting to a sulphur melt the carbazoloicacidurylid-indophenols, described in our copend-- ing application Serial No. 2926 filed J anu ary 16, 1925. These carbazoloic-acl d-aryl dindophenols are obtained by, reacting wlth prima and secondary in resence of con ensing agents upon carbazololc acids. the carbaz'oloic acid arylids obtained in this 1! wa condense easily with .nitroso-phenols and the arylid-indophenols obtained areof the following general formula The sulphur vat colors dye the reducing containing 4 bath sha es, which by oxidation turn-from y The arylid-indophenols from-1:11; different.

carbaxoloic acids,

as for example, the carbaz ol-l-carboxylic I the carbaaol-2-carboxylic acid,

in the production the carbarzol-3-carboxylic acid,

can be used' the hydroxyl group being substltuted by primary or secondary aliphatic oraromatlc amlnes, arylides of the type:

- UM -s a boiling temperature with sodium sulphite and sulphur, which processis generally lrnown as the alcoholic reflux fusion. The following exam les will further i1lus trate our invention, it eing understood that for the practice of our invention we do not limit ourselves to the specific conditions nor to the specific carbazoloic acid arylid-indophenols mentioned. I

Example 1.- parts by] weight of 2-carbazoloic acid-,dimethyl amid in'dophenol having the formula:

are dissolved 195t).parts of alcohol and 190 parts anhydrous sodium sulphide and 525 parts sulphur added. The reactionmass is'boiled at reflux for hours. .The aloof holis distilled ofi, the residues digested with I0 water, and'the insolubledyestuff. filtered as. The unreacted sulphur contained in cHONn-co are submitted, as in Example 1, to the alcoholic reflux sulphur fusion; The residue,

after the alcohol has been distilled off, is

taken up with a'sodium sulphide solution to dissolve the unreacted sulphur, the dyestufi is then filtered ofi', washed with water and dried. The dyestufi is a black powder, insoluble in water and in sodium sulphide are dissolved in 1950 parts of alcohol and 190 parts anhydrous sodium sulphide and 525 parts sulphur added. The fusion is heated at reflux for 120 hours and the residue, after distilling the alcohol, purified by treating same with a sodium sulphide solution. The'insoluble dyestufl is filtered off, washed with water and dried. It is a dark black powder, insoluble in water and sodium sulphide solutions, soluble in concentrated sulphuric acid with a blue green color. With sodium hydrosulfite solutions it forms a yellow colored vat, from which cotton is dyed, afteroxidation, a greenish black of excellent fastness.

Example 4.90 parts of l-carbazoloic-l acid-2-carbazolamidindophenol are dissolved in 1950 parts of alcohol, and 190 parts anhydrous sodium sulphide and 525 parts sulhur added. The fusion is refluxed for 120 ours, the alcohol distilled ofl and the color purified from unreacted sulphur by treating same with a sodium sulphide solution. Filtered ofi", washed and dried the color represents a dark black ow-der, soluble in concentrated sulphuric acid with-blue green color, insoluble in water and sodium sulphide solutions. With sodium hydrosulfite 1t forms a yellow vat from which cotton is dyed, after-oxidation, exceedingly fast dark -b ue shades.

We claim 1. The process of producing vat sulphide d es which consists in submitting to the sulp ur fusion carbazoloic-acid-arylid-indophenols.

solution, soluble in concentrated sulphuricacid with blue green color.

In sodium hydrosulfite solutions it forms a yellow vat, from which cotton is dyed, after oxidation, exceedingly fast bluish black shades.

- Example 3.-72 parts by weight of 3-car-,

bazoloic-acid-para-toluid-indophenol having the formula:

p ur fusion 2-carbazoloic-acid-aryli-d-indophenols.

3. The process of producing a vat sulphlde d e which consists 1n submitting to the sulp ur fusion the 2-carbazoloic acid dimethyl- I amid indophenol.

4. In processes of producing vat sulphide dyes the steps comprising dissolving a carbazoloic-acid-arylid-indophenol in alcohol and heating this solution in. presence of sodiumsulphide and sulphur to effect sulphurization. 5. In processes of producing vat sulphide dyes the steps comprising dissolving 2-carbazoloic-acid-ary1id-indophenols in alcohol and heating this solution in presence of sodium sulphide and sulphur to effect sulphurization.

6. In the process of producing a vat sulphide dye the steps comprising dissolving 2- carbazoloic-acid dimethylamid indophenol in alcohol and heating this solution in presence of sodium sulphide and sulphur to effect sulphurization.

7. As new products the vat sulphide dyes, obtainable" by the sulphurization of carbazoloic-acid-arylid-indophenols, which dyestufls are dark black powders, insoluble "in water and sodium sulphide solutions, soluble in concentrated sulphuric acid with from blue to con blue co ors', giving with sodium hydroslfi fite yellow vats, from which cotton is d ed, after oxidation, from blue to black sha es of exceedingly good fastnes.

8. As new products the vat sulphide dyes,

sulphide solutions, soluble in concentrated sulphuric acid with from blue to green blue colors, giving with sodium hydrosulfite yellow colored vats, from which cottonis dyed, after oxidation, in from blue to black shades, particularly fast to chlorine and boiling.

9. As a new product the vat sulphide dye obtainable by sulphurization in alcoholic solution of Q-carbazoloic-acid-dimethylamidindophenol, which dyestufi is a black powder, insoluble in water and in sodium sulphide solutions, soluble in concentrated sulphuric acid with a blue green color giving with sodium hydrosulfite colored vat from which cotton is oxidation, exceedingly fast dark blue shades.

In testimony whereof we have hereunto set our hands.

FRITZ BALLAUF. FRIEDRICH MUTH.

ALBERT SOHMELZER.

a yellow, dyed, after 20 

